CVE-2022-1237 in radare2
Summary
by MITRE • 04/06/2022
Improper Validation of Array Index in GitHub repository radareorg/radare2 prior to 5.6.8. This vulnerability is heap overflow and may be exploitable. For more general description of heap buffer overflow, see [CWE](https://cwe.mitre.org/data/definitions/122.html).
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Analysis
by VulDB Data Team • 04/08/2022
The vulnerability identified as CVE-2022-1237 represents a critical heap buffer overflow condition within the radare2 reverse engineering framework, specifically affecting versions prior to 5.6.8. This issue manifests in the improper validation of array indices during memory operations, creating a scenario where attacker-controlled input can cause unauthorized memory access patterns. The vulnerability resides in the core memory management functions of the software, making it particularly dangerous as it can be leveraged to execute arbitrary code or cause application crashes. The heap overflow condition occurs when the software processes array indexing without adequate bounds checking, allowing memory writes beyond allocated buffer boundaries. This flaw directly aligns with CWE-122 which defines heap-based buffer overflow conditions where insufficient validation of array indices leads to memory corruption. The vulnerability impacts the fundamental operation of radare2, a widely-used binary analysis tool that serves security researchers, developers, and penetration testers in examining executable files and memory dumps. Given radare2's extensive use in security analysis and reverse engineering workflows, this vulnerability poses significant risk to users who may inadvertently process malicious files or data streams through the application.
The technical exploitation of CVE-2022-1237 requires an attacker to craft input that triggers the vulnerable array indexing logic within radare2's memory handling routines. When the software processes certain binary formats or memory structures, it may attempt to access array elements beyond the allocated heap memory regions, resulting in heap corruption. This memory corruption can manifest as overwrite of adjacent heap metadata, leading to potential code execution through controlled memory layout manipulation. The vulnerability's exploitable nature stems from the lack of proper input validation and bounds checking in array access operations, which is a common pattern in memory safety issues. Attackers can potentially leverage this vulnerability by providing malicious input files that, when processed by radare2, trigger the faulty array indexing code path. The heap overflow can be particularly challenging to exploit due to modern memory protection mechanisms like stack canaries, address space layout randomization, and data execution prevention. However, the vulnerability remains a serious concern because it can be combined with other techniques to bypass these protections, making it a valuable target for advanced exploitation scenarios.
The operational impact of CVE-2022-1237 extends beyond simple application crashes, as it can provide attackers with remote code execution capabilities in scenarios where radare2 is used to analyze untrusted binary data. Security professionals who rely on radare2 for malware analysis, vulnerability research, and binary exploitation may inadvertently expose themselves to remote compromise when processing malicious files. The vulnerability affects both local and network-based attack vectors, as attackers can craft malicious input files that trigger the heap overflow when opened by the vulnerable radare2 version. Organizations using radare2 in automated analysis pipelines, security research environments, or as part of their incident response toolchains face significant risk from this vulnerability. The impact is particularly severe in environments where radare2 is used to process files from untrusted sources or where it operates in automated processing modes without proper input sanitization. This vulnerability can also affect continuous integration systems or automated security scanning tools that utilize radare2 for binary analysis, potentially creating supply chain compromise scenarios. The vulnerability's presence in widely-distributed security tools means that the attack surface extends across multiple organizations and security teams who may be unknowingly exposed to this risk.
Mitigation strategies for CVE-2022-1237 primarily focus on upgrading to radare2 version 5.6.8 or later, which includes proper array index validation and bounds checking mechanisms. Organizations should implement immediate patch management procedures to ensure all instances of radare2 are updated to secure versions. In environments where immediate patching is not feasible, input validation and sanitization measures should be implemented to prevent processing of untrusted binary data through the vulnerable software. Security teams should also consider implementing network segmentation or application whitelisting to limit access to radare2 installations and reduce potential attack surfaces. The vulnerability's classification as a heap-based buffer overflow makes it susceptible to standard security hardening techniques, including compiler-based protections such as stack canaries and address space layout randomization. Regular security assessments and vulnerability scanning should include checks for the presence of vulnerable radare2 versions, particularly in environments where binary analysis tools are deployed. Additionally, security teams should monitor for any reported exploitation attempts or related vulnerabilities that may compound the risk associated with this heap overflow condition. The remediation process should also include comprehensive testing of the patched version to ensure that the vulnerability is fully resolved without introducing regressions in functionality. Organizations should also consider implementing automated monitoring for any suspicious usage patterns or exploitation attempts that may indicate successful exploitation of this vulnerability.